期刊
CARBOHYDRATE POLYMERS
卷 96, 期 1, 页码 270-276出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.03.044
关键词
Starch-based film; Citric acid; Cross-linking; Molecular weight; Hydrolysis; Amorphous starch; Plasticization
资金
- VINNOVA
The effect of citric acid (CA) on starch films has been examined. A new method to detect cross-linking of starch by CA in solution-cast films by molecular weight measurements is described. Furthermore, we managed to distinguished between free, mono- and di-esterified CA and quantify di-ester content within starch films by using a modification in the method of complexometric titration with copper(II)-sulfate. Cross-linking of starch by CA occurred at low temperature, 70 degrees C, which we assumed is so far the lowest temperature reported where cross-linking reaction occurred. This is essential for starch coating applications within paper industry since no high temperatures for curing will be required. However, curing at 150 degrees C and high CA concentrations, 30 pph, increased cross-linking reaction. Furthermore, the physical properties like water solubility, gel content and glass transition temperature, were highly reflected by changes in the molecular structure i.e. cross-linking and hydrolysis, as well as CA content and curing temperature. (C) 2013 Elsevier Ltd. All rights reserved.
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